Table 1: Fungal Particulate Air Sample Results. ST-32 Room 17; post clean-up 5. 2 nd floor; commons area adjacent to Room 617

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1 November 29, 2016 Chuck Doan Yakima School District #7 104 N 4th Avenue Yakima, WA Via Regarding: doan.chuck@yakimaschools.org Fungal Sample Results Blue Wall Room 617 Eisenhower High School Yakima, Washington PBS Project: Dear Mr. Doan: On November 28, 2016, PBS Engineering and Environmental Inc. (PBS) performed air sampling for fungal particulate matter in Room 617 at Eisenhower High School in Yakima, Washington following cleaning activities. Additional samples were collected outside the room and outside the building for comparison purposes. The sampling was performed to document possible airborne fungal concentrations following cleaning by District personnel in Room 617. FUNGAL PARTICULATE AIR SAMPLING Samples were collected at approximately 9:00a.m. during normal HVAC operations. Samples were collected using Allergenco-D sampling cassettes (spore traps) with a high-volume vacuum pump. Each sample was collected at a flow rate of 15 Liters per minute for ten (10) minutes (150 liters total per sample) from approximately four (4) feet above floor level. Samples were submitted under chain of custody to Lab/Cor, Inc. of Seattle, Washington for non-viable fungal particulate identification and quantification by optical microscopic methods. Below is a table summarizing the laboratory results. Table 1: Fungal Particulate Air Sample Results Sample Number Sample Location Total Count ST-32 Room 17; post clean-up 5 ST- 2 nd floor; commons area adjacent to Room ST-34 Outdoor; comparison 630 Overall, total fungal particulate concentrations were lower indoors compared to outdoor fungal particulate concentrations. The predominant types of fungal particulates identified in the samples collected from indoors are also identified in the outdoor sample. 400 Bradley Boulevard, Suite 300, Richland, WA Main Fax Bend Boise Coos Bay Eugene Portland Seattle Tri-Cities Vancouver Walla Walla

2 Chuck Doan Proposal for Fungal Sample Results, Eisenhower High School November 19, 2016 Page 2 of 2 All the types of fungal particulate matter identified and their relative concentrations in the samples, both indoors and outdoors, are typical of the fungal particulate matter observed in samples collected from school sites throughout the region. CONCLUSIONS Airborne fungal particulate concentrations identified in samples collected from indoors are significantly lower than outdoor concentrations. No unusual or musty odors were observed during this sampling event. There does not appear to be a significant airborne fungal particulate concern in Room 617 at Eisenhower High School at the time of this sampling event. LIMITATIONS The findings and conclusions in this report are limited to the areas inspected as well as the professional judgment concerning the significance of the data gathered during the investigation. Only accessible areas and materials were examined during this investigation Please feel free to contact me at or Kristen.hunt@pbsenv.com with any questions or comments. Sincerely, PBS Engineering and Environmental Inc. Kristen Hunt Project Manager - IH Attachments: KH/JP

3 Lab/Cor, Inc th Ave NW Seattle, WA Job Number: SEA Client: PBS Engineering + Environmental Address: 400 Bradley Blvd Richland, WA Project Name: Eisenhower - Blue Wall Project No.: PO Number: Sub Project: Reference No.: Analysis Report Cover Final Report A Professional Service Corporation in the Northwest Enclosed please find results for samples submitted to our laboratory. A list of samples and analyses follows: Phone: (206) Report Number: R01 Report Date: 11/29/2016 Lab/Cor Sample # Client Sample # and Description Analysis Analysis Notes Date Received: S1 ST-32 - Room Post Clean NV, Air, Fungal ID 11/28/ S2 ST- - Hall Outside Room 617 NV, Air, Fungal ID 11/28/ S3 ST-34 - Outside Comparison NV, Air, Fungal ID 11/28/2016 Nonviable Air Air samples follow preparation and analysis techniques outlined in Method 5 of the laboratory SOP; this method is based on guidelines from the Pan-American Aerobiology Association Standardized Protocol and ASTM Method Samples were collected using either an Air-O-Cell, Cyclex D, Allergenco-D, or M2 Multi-Mold nonviable air sampling cassette. Characteristic morphologies were observed by optical microscopy at a magnification of 600x. For each individual particle type observed, data was reported in particles per cubic meter of air (m3). Due to various factors that influence uncertainty (media type, particle loading, staining, instrumentation and other variable aspects of the method), only the first two figures reported are considered to be significant. The area analyzed on each sample is 20%. Disclaimer The results reported relate only to the samples tested or analyzed; the laboratory is not responsible for data collected by personnel who are not affiliated with the laboratory. Results reported in both structures/cm3 and structures/mm2 are dependent on the sample volume and area. These parameters are measured and recorded by non-laboratory personnel and are not covered by the laboratory s accreditation. Interpretation of these results is the sole responsibility of the client. If further clarification of these results is needed, please call us. Thank you for allowing the staff at Lab/Cor, Inc. the opportunity to provide you with the analytical services. Sincerely, Ashley Tonge Technician/Analyst Page 1 of 3

4 Lab/Cor, Inc th Ave NW Seattle, WA Job Number: Client: PBS Engineering + Environmental Date Received: 11/28/2016 Project Name: Eisenhower - Blue Wall Project No.: Reference No.: Final Report A Professional Service Corporation in the Northwest Nonviable Air Phone: (206) Report Number: R01 Lab/Cor ID: Sample No.: Description: S1 ST-32 Room Post Clean S2 ST- Hall Outside Room 617 Sample Measure: 150 L 150 L Media Type: Fungal-AllergencoD Fungal-AllergencoD Analyst - Analysis Date: AT - 11/29/2016 AT - 11/29/2016 MRL: 1 Scope - Magnification: Olympus BHT-BH2-600 Olympus BHT-BH2-600 Notes: Fungal Identification Raw Count* Total Count** Total/m³ Raw Count* Total Count** Total/m³ Alternaria Ascospores Aspergillus/ Penicillium-like Aureobasidium Basidiospores Cladosporium Epicoccum Hyphal Fragments Myxo./ Periconia/ Smuts 1 5 Oidium/ Peronospora Rust Spore Summary Total: * - Raw Counts per 20% of Sample ** - Total Count per Sample Page 2 of 3

5 Lab/Cor, Inc th Ave NW Seattle, WA Job Number: Client: PBS Engineering + Environmental Date Received: 11/28/2016 Project Name: Eisenhower - Blue Wall Project No.: Reference No.: Final Report A Professional Service Corporation in the Northwest Nonviable Air Phone: (206) Report Number: R01 Lab/Cor ID: Sample No.: Description: S3 ST-34 Outside Comparison Sample Measure: 150 L Media Type: Fungal-AllergencoD Analyst - Analysis Date: AT - 11/29/2016 MRL: Scope - Magnification: Olympus BHT-BH2-600 Notes: Fungal Identification Raw Count* Total Count** Total/m³ Raw Count* Total Count** Total/m³ Alternaria 1 5 Ascospores Aspergillus/ Penicillium-like Aureobasidium Basidiospores Cladosporium Epicoccum 1 5 Hyphal Fragments 1 5 Myxo./ Periconia/ Smuts Oidium/ Peronospora 1 5 Rust Spore 1 5 Summary Total: Reviewed by: Ashley Tonge Technician/Analyst * - Raw Counts per 20% of Sample ** - Total Count per Sample Page 3 of 3

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